Transformations of N-arylpropiolamides to indoline-2,3-diones and acids via C≡C triple bond oxidative cleavage and C(sp2)–H functionalization
作者:Ming-Bo Zhou、Yang Li、Xuan-Hui Ouyang、Jin-Heng Li
DOI:10.1007/s11426-019-9633-x
日期:2020.2
A new palladium-catalyzed oxidative conversion of N-arylpropiolamides and H2O to various indoline-2,3-diones and acids through the C≡C triple bond cleavage and C(sp2)–H functionalization is described, which is promoted by a cooperative action of catalytic CuBr2, 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) and O2. The method provides a practical tool for transformations of alkynes by means of a C–H
Catalytic oxidation/C–H functionalization of N-arylpropiolamides by means of gold carbenoids: concise route to 3-acyloxindoles
作者:Deyun Qian、Junliang Zhang
DOI:10.1039/c2cc31972a
日期:——
An efficient catalytic CâH functionalization by means of gold carbenoids for the one-step synthesis of 3-acyloxindole derivatives has been developed. The reaction proceeds efficiently with extremely good substrate scope and significant opportunities for structural diversification.
Visible-Light-Mediated ipso-Carbosulfonylation of Alkynes: Synthesis of 3-Sulfonylspiro[4,5]trienones from Propiolamides and Sulfonyl Chlorides under Transition-Metal-Free Conditions
sulfonylation and ipso-cyclization of alkynes. In this transformation, the O atom in the newly generated carbonyl is derived from H2O and it features a broad substrates scope, especially for alkyl propiolamides and aliphatic sulfonyl chlorides.
已开发出一种高效便捷的合成多种 3-磺酰基螺[4,5] 三烯酮的策略。这种炔烃的同位碳磺酰化在无过渡金属条件下通过可见光催化进行,代表了炔烃的新磺酰化和同位环化。在这种转化中,新生成的羰基中的 O 原子来源于 H2O,它具有广泛的底物范围,特别是对于烷基丙酰胺和脂肪族磺酰氯。
Access to 3‐(2‐Oxoalkyl)‐azaspiro[4.5]trienones
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Acid‐Triggered Oxidative Cascade Reaction through Alkenyl Peroxide Radical Intermediate
作者:Chang‐Sheng Wang、Thierry Roisnel、Pierre H. Dixneuf、Jean‐François Soulé
DOI:10.1002/adsc.201801203
日期:2019.2
Azaspiro[4.5]trienones bearingketone side chains at the 3‐position are prepared from N‐alkyl‐arylpropiolamides and ketones via oxidative 1,2‐difunctionalization of alkynes. The cascade sequence starts with the generation of alkenyl peroxide intermediates, which are obtained by addition of tert‐butyl hydroperoxide to ketones in presence of a catalytic amount of a strong acid. Then, the ketone radical adds to
Visible-light promoted one-pot synthesis of sulfonated spiro[4,5]trienones from propiolamides, anilines and sulfur dioxide under transition metal-free conditions
A novel visible-light promoted sulfonylation/ipso-cyclization of N-arylpropiolamides with aromatic amines and DABCO·(SO2)2 to synthesize various sulfonated spiro[4,5]trienones is reported.